Abrading-shoe.



. PATEHIED SEPT. 1, 1903. J. M. GRIFFIN. v ABRADING SHOE.-

LPPLIOATIOI IILRD: JAE.v 15, 1993.

INVENTOR fliiorneys.

no uonsn.

WITNESSES UNITED STATES Patented September 1,1903.

PATENT OFFICE.

ABRADlNG-SHOE.

$PECIFICATION forming part of Letters Patent No. 738,029, datedSeptember 1, 1903.

Application filed January 15, 1903. Serial No. 139,102. (No model.)

To all whom it may concern.-

Be it known that'I, JUDSON M. GRIFFIN, a citizen of the United States,residing at Detroit, county of Wayne, State of Michigan, have invented acertain new and useful Improvement in AbradingShoes; and I declare thefollowing to be a full, clear, and exact description of the same, suchas will enable others skilled in the art to which it pertains to makeand use the same, reference being had to the accompanying drawings,which form a part of this specification.

This invention relates to abrading-shoes for truing up car-wheels, andhas for its object an improved form of abrading-shoe adapted to be usedfor the specified purpose.

In the drawings, Figure 1 is a perspective of a shoe embodying theinvention. Fig. 2 is a cross-secti0n at the line a: at of Fig. 1. Fig. 3is a perspective of a shoe embodying the same invention, but arranged tobe used for grinding the wheel at a different'place from the placeground when the shoe shown in Fig. 1 is used.

Oar-wheels when in use become worn in spots or in lines, and in truingthem up with an abrading-shoe it is desirable that the shoe be soconstructed that at all times it will engage closely across the entireedge surface of the wheel; but if the shoe be made with anabrading-surface of uniform hardness it grinds and cuts away some partsthat should not be ground and cut away. To prevent this, I make theabrading-shoe of a case of metal of proper shape and fill into the caseof metal abrading-blocks which are made hard and are adapted to cut inthose places which will contact the parts of the wheel that are to'becut away and make it soft and friable in those parts of the shoe whichare to contact the portions of the wheel that are not to be cut away,yet the soft and friable parts are made sufficiently hard to retaintheir shape and act as a support or rest against the surface of thewheel, so that all parts of the abrading-block, both those which arecutting and those which are not cutting, are in contact with the wheelunder treatment and are acting as a frictional brake-for example, inthe'form shown in Fig. 1, which is intended to be used to grind theflange of a wheel. The case A is provided with a number of pockets 1, 2,and 3, all filled with abrading material that is hard and cutting at thepart 4, which engages the flange of the wheel, and the part 5 is filledwith softer and more friable or non-abrasive material, which whilesupporting the abrasive blocks will serve as an ordinary friction-brakeand furnish a support for the shoe against the tread of the wheel.

In the form shown in Fig. 3 the case B is divided into pockets 7, 8, and9, which are filled with abrading material with the side sections 10,10, 11, 11 of hard durable cutting material and between the hardsections is interposed a section 12 12-' of softer and more friablematerial or a non-abrasive material. A shoe thus formed is intended tocut the tread of a wheel that has been worn along the middle linethereof, in which case it is desirable to cut away the two sides of thetread, leaving the middle line, the most worn part of the tread, withoutcutting it to any extent.

What I claim is 1. In an abrading shoe for truing carwheels, thecombination of a case adapted to hold abrading-blocks, a block made insections of hard grinding material and non-abrasive material,substantially as described.

2. In an abradingshoe for truing carwheels, a block having one partthereof made abrasive, and one part thereof made non-abrasive for thepurpose specified.

3. In an abrading shoe for truing carwheels, a block having separateportions of unequally-abrading quality, substantially as described.

In testimony whereof I sign this specification in the presence of twowitnesses.

JUDSON M. GRIFFIN.

